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Postretirement Benefits | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Pension and Other Postretirement Benefits | Postretirement Benefits The Company has defined contribution plans, qualified and nonqualified defined benefit pension plans and other postretirement benefit plans covering substantially all of its employees. The Company's contributions to its defined contribution plans include matching and annual discretionary contributions which are based on various percentages of compensation, and in some instances are based on the amount of the employees' contributions to the plans. See Note 17 in the Notes to Consolidated Financial Statements in the 2017 Form 10-K for further details regarding these plans. Pension and other postretirement benefit costs included the following components for the three months and six months ended June 30, 2018 and July 1, 2017:
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
(in millions) | Jun 30, 2018 |  | Jul 1, 2017 |  | Jun 30, 2018 |  | Jul 1, 2017 |  | Jun 30, 2018 |  | Jul 1, 2017 |  | Jun 30, 2018 |  | Jul 1, 2017
Interest cost | $ | 5.7 |  |  | $ | 7.1 |  |  | $ | 11.4 |  |  | $ | 14.2 |  |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 0.7 |
Expected return on plan assets | (6.4 | ) |  | (8.3 | ) |  | (12.7 | ) |  | (16.7 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credits | — |  |  | — |  |  | — |  |  | — |  |  | (0.1 | ) |  | (0.2 | ) |  | (0.3 | ) |  | (0.4 | )
Amortization of net actuarial losses | 2.6 |  |  | 3.6 |  |  | 5.1 |  |  | 7.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Net pension and other benefit costs | $ | 1.9 |  |  | $ | 2.4 |  |  | $ | 3.8 |  |  | $ | 4.7 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |
Employer Contributions and Benefit Payments. During the six months ended June 30, 2018 and July 1, 2017, the Company contributed $35.0 million and $40.0 million, respectively, to its qualified pension plans. Company contributions are subject to change based on funding regulations and Company discretion. During the six months ended June 30, 2018 and July 1, 2017, the Company contributed $2.1 million to fund benefit payments to its nonqualified pension plan.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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